1,720,986 research outputs found
I movimenti antinucleari dagli anni Quaranta agli anni Sessanta
No full textIl saggio analizza la storia del movimenti antinucleari dal loro inizio negli anni '40 alla loro diffusione di massa all'inizio degli anni '60. Dopo un esame delle difficoltà che la storiografia continua ad avere nell'affrontare il tema, viene esaminato il ruolo decisivo degli scienziati e della loro politicizzazione nell'origine del movimento, quindi come la Guerra Fradda portò alla nascita di due movimenti diversi e opposti (quello comunista e quello indipendente), lo sviluppo di una "mentalità nucleare" nella seconda metà degli anni '50, e infine il legame tra paura atomica e protesta politica e sociale all'inizio degli anni '60. Le ultime pagine affrontano il tema dell'efficacia politica dei movimenti.The essay is devoted to an historical analysis of antinuclear movements since their beginning in the 1940s to their mass spreading in the early 1960s. After an analysis of the difficulties history has in dealing with this subject, the essay examines how the politicization of scientists was the decisive factor in the birth of the movement, than shows how the Cold War gave rise to two different and contrasting movements (one communist, one independent, the development of a "nuclear mentality" in the second half of the 1950s, the link between nuclear fears and social and political protest at the beginning of the 1960s. The last pages propose a final discussion of their political effectiveness
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
1d modelling and simulation of a piezo injector for spray guided gasoline direct injection systems
No full textThe aim of this work was the modelling and the simulation of the Piezo injector, developed by Siemens VDO Automotive for “spray guided” Gasoline Direct Injection (GDI) systems.
The development of the model was based on a 1D lumped parameter approach, which was performed in the AMESim environment. The injector was accurately modelled in its three subsystems, namely the piezo actuator, the thermal compensator and the valve body, in order to have a complete control on its behaviour.
The reliability and the accuracy of the models of each subsystem were evaluated through comparisons with experiments for various operating points.
The last part of this work describes some applications where the model was used and it demonstrates how accurate modelling and simulation may allow a real contribution in the understanding and optimization of the injector behaviour, reducing time and costs that are involved in an only experimental analysis
- …
